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Business Segment Information (Property Plant And Equipment Net Of Depreciation By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Property and equipment, net	$ 1,485,875	$ 1,459,669	$ 1,452,842
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	1,180,586	1,163,320	1,162,217
United Kingdom [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	304,062	281,430	275,012
Other [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 1,227	$ 14,919	$ 15,613

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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